The important statement in the Third McLuhan Monday Night Seminar, posted by Andrew McLuhan a couple of years ago, is:
at 1:31:06 –
“So what we’re seeing is that the old ground rules reverse and change, and the question is what are the new ground rules. So, there aren’t any. They’re process patterns.” – Barrington Nevitt
See bottom paragraph of p.137 of TAKE TODAY (1972).